Greg Plitt, 37, was struck on Saturday afternoon on the tracks near Burbank Metrolink station.
Several radio stations are reporting that the former model may have been filming with friends at the time.
Police have confirmed they seized recording equipment from the scene.
Greg Plitt recently starred in the Bravo show Work Out and is due to feature in a new reality series called Friends to Lovers later this month.
A Bravo spokesperson said: “This is a terrible tragedy. Our thoughts and deepest sympathy are with Greg’s family and friends.”
Fellow workout guru Rob Riches has tweeted that the world has lost a fitness icon.
Greg Plitt acted in a number of movies, appearing alongside Robert De Niro and Matt Damon in The Good Shepherd, and with Christian Bale in Terminator 4.
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